[Analysis of reflex thermoregulatory reactions induced by thermal stimulation of the trigeminal zone]. / Analiz reflektornykh reaktsii termoreguliatsii, vyzyvaemykh termicheskim razdrazheniem trigeminal'noi zony.

In anesthetized rabbits, the activity of thermoreceptors, the neuronal activity in the preoptic area of hypothalamus (POAH), and the efferent outflow in sympathetic fibres of the auricular nerve were studied during thermal stimulation of the skin innervated by the trigeminal nerve. Among 79 receptors 8 responded to warming of the skin and 38 responded to cooling with the maximal activity at the skin temperature 22-21 degrees C. The activity of 46 POAH neurons out of 94 correlated with the skin temperature: 34 neurons increased the frequency of firing during cooling and 12 during warming. The firing rate in the sympathetic ganglion cells and postganglionic fibers increased by 50-100% during cooling causing vasoconstriction of the rabbit's ear, while warming of the receptive zone reduced the activity by 56-48% or abolished it, leading to vasodilatation.

[Effect of a hypogeomagnetic field on warm-blooded animals]. / K voprosu o vliianii gipogeomagnitnogo polia na teplokrovnykh zhivotnykh.

This paper presents the study of the effect of a 3-month exposure of adult male rats of the Wistar strain to the hypogeomagnetic field (the shielding factor = 172.5) on their behavior, learning ability, cardiovascular function and work capacity. It was found that the exposure led to a significant decrease of work capacity, endurance and behavioral activity as well as to a significant increase of heart rate and time of conditioned reflex development. The above changes remained within physiological limits due to which they can be viewed as adaptation variations.